/*******************************************************************************
 * Copyright 2011 The fangorn project
 * 
 *        Author: Sumukh Ghodke
 * 
 *        Licensed to the Apache Software Foundation (ASF) under one
 *        or more contributor license agreements.  See the NOTICE file
 *        distributed with this work for additional information
 *        regarding copyright ownership.  The ASF licenses this file
 *        to you under the Apache License, Version 2.0 (the
 *        "License"); you may not use this file except in compliance
 *        with the License.  You may obtain a copy of the License at
 * 
 *          http://www.apache.org/licenses/LICENSE-2.0
 * 
 *        Unless required by applicable law or agreed to in writing,
 *        software distributed under the License is distributed on an
 *        "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *        KIND, either express or implied.  See the License for the
 *        specific language governing permissions and limitations
 *        under the License.
 ******************************************************************************/
package au.edu.unimelb.csse.analyser;

import java.util.LinkedList;
import java.util.List;

public class NodeCache {
	private static final List<Node> cache = new LinkedList<Node>();
	
	public static Node get() {
		if (cache.size() == 0)
			return new Node();
		return cache.remove(0);
	}
	
	public static void returnNodeDeep(Node r) {
		if (r.children.size() > 0) {
			for (Node child : r.children) {
				NodeCache.returnNodeDeep(child);
			}
		}
		r.clear();
		cache.add(r);
	}

	public static int cacheSize() {
		return cache.size();
	}
	
	public static void clear() {
		cache.clear();
	}
}
